Fix missing return of runtime in optimizer

Author: JanLuca

varipeps/optimization/optimizer.py

@@ -444,6 +444,7 @@ def random_noise(a):
                         step_energies=step_energies,
                         step_chi=step_chi,
                         step_conv=step_conv,
+                        step_runtime=step_runtime,
                         best_run=0,
                     )
                 elif (